(this == null) in C#!

Question

Due to a bug that was fixed in C# 4, the following program prints true. (Try it in LINQPad)

void Main() { new Derived(); }

class Base {
    pu         


        

Answer 1

Not sure if this is what you are looking for

    public static T CheckForNull(object primary, T Default)
    {
        try
        {
            if (primary != null && !(primary is DBNull))
                return (T)Convert.ChangeType(primary, typeof(T));
            else if (Default.GetType() == typeof(T))
                return Default;
        }
        catch (Exception e)
        {
            throw new Exception("C:CFN.1 - " + e.Message + "Unexpected object type of " + primary.GetType().ToString() + " instead of " + typeof(T).ToString());
        }
        return default(T);
    }

example: UserID = CheckForNull(Request.QueryString["UserID"], 147);